Function nix_get_attr_byname_lazy 

pub unsafe extern "C" fn nix_get_attr_byname_lazy(
    context: *mut nix_c_context,
    value: *const nix_value,
    state: *mut EvalState,
    name: *const c_char,
) -> *mut nix_value

Get an attribute value by attribute name, without forcing evaluation of the attribute’s value @ingroup value_extract Returns the attribute value without forcing its evaluation, allowing access to lazy values. The attribute set value itself must already be evaluated. Call nix_value_decref() when you’re done with the pointer

Arguments

• context [out] - Optional, stores error information
• value [in] - Nix value to inspect (must be an evaluated attribute set)
• state [in] - nix evaluator state
• name [in] - attribute name

Returns

value, NULL in case of errors